Mechanism for rolling.



(No Model.)

L. D. DAVIS.

MECHANISM FR ROLLING.

(Appnfmon mea may 2s, 1900.,

Patented. Nov. 2u, |900.

No. 662,|46. Patented Nov. 20, |900.

L. D. DAVIS. v

M-ECHANISNI FOB ROLLING.

(Application led May 23, 190 (No Model.) 2 Sheets-Sheet 2.

ilNirnD STATES PATENT OFFICE.

LEONARD D. DAVIS, OF ERIE, PENNSYLVANIA.

MECHANISIVI FOR ROLLING.

SPECIFICATION forming part of Letters Patent No. 662,146, dated November 20, 1900.

Application filed May 23. 1900. Serial No. 17,690. (No model.)

T0 all whom it may concern:

Be it known that I, LEONARD D. DAVIS, a resident of Erie, in the county of Erie and State of Pennsylvania, have invented a new and useful Improvement in Mechanism for Rolling Seamless Tubing; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to mills for rolling seamless tubing; and its object is to provide a mill of this character by which it is possible to give a billet two passes at a single heat.

In seamless-tube-rolling mills as heretofore constructed the solid billet is heated and given a pass through piercingrolls, after which the billet is reheated and given a pass through rolls which reduce the thickness of the walls of the pierced billet. It has been attempted to give the billet these two passes at a single heat; but by reason of the construction and arrangement of the mills the billet after being pierced has to be carried around to the forward side of the next mill, during which time it cools sufficiently to prevent the proper rolling thereof.

The object of my invention is to overcome these defects; and to this end it consists in arranging the rolls of seamless-tuberolling mills with the passes in such proximity to each other that a mandrel may be mounted in relation to two passes, so that it will receive the pierced billet from the piercing-rolls and can thereafter be moved into position to deliver the pierced billet into the pass of rolls which reduce the thickness of the walls thereof.

As diagonally-acting rolls for piercing and expanding pierced billets are well known in the art, it is deemed sufcient to. herein show only those parts of the apparatus which are comprehended in the present invention.

The accompanying drawings show my invention by diagrammatic figures, which illustrate the shapes of the rolls, the piercingmandrel, and the relative positions of the rolls and mandrel, no attempt being made to show the housings in which the rolls are mounted nor the gearing for driving the rolls, as these are well understood and can be readily supplied by those skilled in the art.

To enable others skilled in the art to practice my invention, I will describe the same more fully, referring to the accompanying drawings, in which- `Figure l is a diagrammatic view of three rolls arranged to form two passes the axis of which converge at a common point and a mandrel pivoted at such point. Fig. 2 is a similar view of four rolls arranged to form two passes and a mandrel movable from one pass to the other. Fig. 3 is a similar View of four rolls arranged to form two passes the axes of which converge at a common point with a mandrel pivoted at such point; and Fig. 4 is a view similar to Fig. l, showing a pivoted rest for the mandrel, so constructed as to provide a continuous operation of the mill.

In the drawings, Fig. 1, the rolls 1v 2 3 are provided with a cylindrical face 4 and beveled faces 5 and 6 at either side of said cylindrical face. The three rolls rotate in the same direction and are arranged so as to form two passes 7 and 8, the middle roll coperating in the formation of both passes, as will be readily understood. The axes of the rolls l and 3 lie in the saine plane, while the axis of the roll 2 is inclined to said plane, thereby setting the rolls l and 2 and 2 and 3, respectively, askew to each other, so as to feed the billet through the passes 7 and 8, as is well understood in the art. The axes of the passes 7 and 8 converge at the point 9, and at this point is pivoted the rest l0 for the mandrel ll, the point l2 of which lies in the exit end of the pass 7, and said mandrel-stem being adapted to be moved in line with the axis of the pass 8, as shown in dotted lines. The rolls l, 2, and 3 rotate in the same direction, and their-angular relations are such that a billet will be fed in one direction through the pass 7 and in the opposite direction through the pass 8, as will be readily understood. A billet 13 is fed into the pass 7, where it is gripped by the beveled faces 5 of thc rolls l and 2, which reduce the diameter of the billet and develop a tubular formation thereof, as is well understood, the pierced billet passing over the mandrel l1. After the billet is clear of the pass 7 the mandrel ll, together with the billet thereon, is swung aboutthe point 9 into the position shown in dotted lines, and the pierced billet on the mandrel is fed through the pass 8 over IOO the mandrel 14, whereby the thickness of the walls is reduced.

In the form of mill illustrated in Fig. 2 I employ four rolls 15, 16, 17, and 18, all rotating in the same direction and arranged in pairs to form the two passes 7 and 8. The rolls each consist of two frustra of cones with their bases united, thereby forming passes the walls of which first converge and then diverge. The axis of the two passes illustrated in this figure do not converge at a common point, but are parallel to each other, and the mandrel 11 is stepped into a rest 19, which can be moved sidewise in the guides 2O to carrysaid mandrel from the axis of one pass to the axis of the other, as will be readily understood.

In the form of mill illustrated in Fig. 3 are shown four barrel-shaped rolls 21, 22, 23, and 24, arranged in pairs, as in Fig. 2, to form two passes, but with the axespf the passes converging at a common point 9, as in Fig. l, at which pointis pivoted the rest 10, in which the mandrel is stepped. The barrel-shaped rolls disclosed in this ligure form passes the walls of which gradually converge and then diverge as in the other igures, and the operation of the mill is in all particulars the same as that of the mill disclosed in Fig. 1.

In the form of mill shown in Fig. 4 three rolls are employed, each roll having double inclined faces 25 and 26, the axes of the rolls being set at such an angle that these faces form passes the walls of which converge and then diverge, as in the other figures The axes of the two passes 7 and 8 shown in this figure converge at a common point 9, as in Fig. 1, at which point is pivoted the circular block 27, which has about its face a series of sockets 28, in which the mandrel l1 may be stepped. The sockets 28 bear the same angular relations to each other as the angular relation of the two passes 7 and 8, so that a billet may be received upon a mandrel located in line with the pass 7 and the mandrel then swung into line with the pass 8, and while the thickness of the walls of the billet is being reduced in said pass 8 another billet may be received through the pass 7 upon a mandrel stepped .in the next socket, and this can in turn have the thickness of its walls reduced in the second pass, while a third billet is being received upon still another mandrel stepped in the next socket in the block. In this way a practically-continuous operation of piercing and reducing can be carried on.

While in the various figures I have disclosed dierent shapes of rolls with the different arrangement of rolls and passes, it is notto be understood that any one form of roll is essential to any particular arrangement of rolls and passes disclosed, but that it is possible to use any one of the forms of rolls in connection with any one of the arrangements of rolls and passes.

In each of the views the axes of each pair of rolls are shown inclined with reference Ito each other, thereby securing the diagonal action of the rolls on the billet in order to feed the same through the rolls, as is well understood; but I wish it understood that the same arrangement of rolls, passes, and mandrels may be employed with rolls whose axes are parallel to each other. In this case it would necessitate some special means for pushing the billet through the pass; but in other respects the operation would be the same as above described. Furthermore, instead of having the axes of the rolls of each pair inclined with reference to each other in order to secure the diagonal action ofthe rolls on the billet such action may be secured by having the roll-axes lie in parallel planes, with one axis above the other,whe`reby a diagonal action is secured and the billet fed through the rolls, as is well understood in the art.

I have shown and described only two passes and a single mandrel movable into line with each of the passes; but it is obvious that a third mill might be arranged with its pass in such relation to the pass 8 so that the mandrel could be moved to deliver the tube it receives from the pass 8 into the third pass, `and the tube could in turn be delivered in a similar way to a fourth pass, and so on, as often as desired. It will be seen that my invention comprises such an arrangement of a plurality (two or more) of passes of seamlesstube-rolling mills that a mandrel may lie in line with any one pass and be movable into line with` the succeeding pass.

While I intend to use the rolls disclosed for first piercing a billet and then reducing the thickness of the walls of the pierced billet, it is obvious that the mill may be used for merely enlarging or reducing the thickness of the walls of a previously pierced or bored billet, in which case the converging portion of the pass will merely grip the billet suciently to feed the same forward and will not materially reduce the diameter thereof.

What I claim, and desire to secure by Letters Patent, is-

1. In a seamless-tube-rolling mill, the combination with rolls forming two passes, the axes of which converge at a common point, of a mandrel pivoted at the point of convergence of the 'axes of the passes.

2. In a seamless-tube-rolling mill, the combination with three rolls forming two passes, the axes of which converge at a common point, and a mandrel pivoted at the point of convergence of the axes of the passes.

3. In aseamless-tube-rolling mill the combination with diagonally-acting rolls forming a plurality of passes, of a mandrel lying in one pass and movable into line with another pass.

IOC

IIO

4. In a seamless-tube-rolling mill, the combination with three diagonally-acting rolls forming twopasses, theatres o'f which converge at a common point, and a mandrel piv- 1o tween the axes of the passes.

6. Ina seamless-tube-rolling mill, the cornbination with diagonal] y-aoting rolls forming a plurality of passes, each pass having a oonverging entering portion and a diverging exit portion, of a movable mandrel adapted to lie in the diverging portion of one pass and to be moved to lie in the converging portion of another pass.

In testimony whereof I, the said LEONARD D. DAVIS, have hereunto set my hand.

LEONARD D. DAVIS..

Witnesses:

F. W. WINTER, ROBERT C. ToT'rE'N. 

